linux-kernel - Re: [PATCH v2 0/2] Introduce the bulk IV mode for improving the crypto engine efficiency

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Message-ID: <CAMz4kuJ3W-oA9AsOQOT1BWS-cY8UUEgm1UzDKmsFY5QdNG0-oA@mail.gmail.com>
Date:	Wed, 16 Dec 2015 16:31:11 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	Milan Broz <gmazyland@...il.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Alasdair G Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
	neilb@...e.com, dan.j.williams@...el.com,
	martin.petersen@...cle.com, sagig@...lanox.com,
	Kent Overstreet <kent.overstreet@...il.com>,
	keith.busch@...el.com, tj@...nel.org,
	Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	linux-block@...r.kernel.org, linux-raid@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] Introduce the bulk IV mode for improving the
 crypto engine efficiency

On 16 December 2015 at 16:08, Milan Broz <gmazyland@...il.com> wrote:
> On 12/16/2015 04:18 AM, Baolin Wang wrote:
>> From the dm-crypt performance report, we found it shows low efficiency
>> with crypto engine for some mode (like ecb or xts mode). Because in dm
>> crypt, it will map the IO data buffer with scatterlist, and send the
>> scatterlist of one bio to the encryption engine, if send more scatterlists
>> with bigger size at one time, that helps the engine palys best performance,
>> which means a high encryption speed.
>>
>> But now the dm-crypt only map one segment (always one sector) of one bio
>> with one scatterlist to the crypto engine at one time. which is more
>> time-consuming and ineffective for the crypto engine. Especially for some
>> modes which don't need different IV for each sector, we can map the whole
>> bio with multiple scatterlists to improve the engine performance.
>>
>> But this optimization is not support some ciphers and IV modes which should
>> do sector by sector and need different IV for each sector.
>>
>> Change since v1:
>>  - Introduce one different IV mode.
>>  - Change the conditions for bulk mode.
>
> I tried the patchset on 32bit Intel VM and kernel immediately OOPsed (just tried aes-ecb)...
>

I'm sorry for that. I'll check why it will crash though it can work
well on my beaglebone black board. Thanks.

> Crash log below.




-- 
Baolin.wang
Best Regards
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